• 文献标题:   Aqueous Ion Trapping and Transport in Graphene-Embedded 18-Crown-6 Ether Pores
  • 文献类型:   Article
  • 作  者:   SMOLYANITSKY A, PAULECHKA E, KROENLEIN K
  • 作者关键词:   graphene, crown ether, ion transport, ionic transistor, nanofluidic
  • 出版物名称:   ACS NANO
  • ISSN:   1936-0851 EI 1936-086X
  • 通讯作者地址:   NIST
  • 被引频次:   9
  • DOI:   10.1021/acsnano.8b01692
  • 出版年:   2018

▎ 摘  要

Using extensive room-temperature molecular dynamics simulations, we investigate selective aqueous cation trapping and permeation in graphene-embedded 18-crown-6 ether pores. We show that in the presence of suspended water-immersed crown-porous graphene, K+ ions rapidly organize and trap stably within the pores, in contrast with Na+ ions. As a result, significant qualitative differences in permeation between ionic species arise. The trapped ion occupancy and permeation behaviors are shown to be highly voltage-tunable. Interestingly, we demonstrate the possibility of performing conceptually straightforward ion-based logical operations resulting from controllable membrane charging by the trapped ions. addition, we show that ionic transistors based on crown-porous graphene are possible, suggesting utility in cascaded ion based logic circuitry. Our results indicate that in addition to numerous possible applications of graphene-embedded crown ether nanopores, including deionization, ion sensing/sieving, and energy storage, simple ion-based logical elements may prove promising as building blocks for reliable nanofluidic computational devices.